The Savage Time: Part II

This arc continues to be the best of the whole series, with J'onn finally having the character moments and focus he deserves. The twists are nothing particularly surprising, so what really shines is the way the backdrop of WWII allows the league to show time-honored values that the allies similarly held. Bravery, kindness, value for life, and hope all shine here as much as they do in any WWII movies made to encourage the allies during that time.

Then there's Steve Trevor and Wonder Woman. Their relationship is very sweet and fun, and I also think it changes her view towards men throughout the whole series. Steve is a thoroughly decent and charming human being who fits in perfectly with the league despite being a normal person who doesn't have any powers. All in all, rather than being merely a plot device intended to keep the characters busy for a couple episodes, this arc is a character showcase.